
题目内容
Becauseitrequireslesspowertotransmitalowerfrequencyoveragivendistance,uplinkfrequenciesinmobilesystemsarealwaysthelowerbandoffrequencies–thissavesvaluablebatterypoweroftheMSs.

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小孟
:f10dd61be01a4407865c9619ed22ea42

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